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30 Mar 2020, 08:12
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Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
45%
(medium)
Question Stats:
66% (01:57) correct
34%
(01:58)
wrong
based on 679
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Not surprisingly, there are no professors under the age of eighteen. And as is well known, no one under eighteen can vote legally. Finally some brilliant people are professors, some are legal voters, and some are under eighteen.
If the statements above are true, then on the basis of them which one of the following must also be true?
(A) No professors are eighteen-year-olds.
(B) All brilliant people are either professors, legal voters, or under eighteen.
(C) Some legal voters are not professors.
(D) Some professors are neither legal voters nor brilliant people.
(E) Some brilliant people are neither professors nor legal voters.
If the statements above are true, then on the basis of them which one of the following must also be true?
(A) No professors are eighteen-year-olds.
(B) All brilliant people are either professors, legal voters, or under eighteen.
(C) Some legal voters are not professors.
(D) Some professors are neither legal voters nor brilliant people.
(E) Some brilliant people are neither professors nor legal voters.
03 Oct 2020, 14:50
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honey1
Hello, honey1. To answer your last question first, you may want to explore different ways of approaching the same question. Some people will swear by diagramming; others, like myself, write nothing down. But in either case, practice is essential to be able to spot the logical underpinnings of a passage. Consider choice (C) again:
Bunuel
For this to be true necessarily (i.e. to fit a must-be-true condition), we need to find information about voters who are definitely not professors. What does the passage tell us? It is not until the final line that we get any information about brilliant (but not necessarily professorial) people.
Bunuel
To summarize:
1) No professors are under 18.
2) No one under 18 can legally vote.
3.1) Some brilliant people are professors. (Therefore, these brilliant people must be 18+.)
3.2) Some brilliant people are legal voters. (Therefore, these brilliant people must be 18+.)
3.3) Some brilliant people are under 18. (Therefore, this subset of brilliant people must not be professors or legal voters.)
As you can see, we have no information about the voting population, in terms of the professions people hold. We cannot say for certain whether any of these brilliant professors are the same people who comprise legal voters. The term some is too vague. But we can use that same understanding to qualify choice (E), as statement 3.3) shows above.
I hope that helps. I have done the best I can to try to trace my thought process.
- Andrew
15 Apr 2020, 04:46
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Bunuel
NOTE: Question says MUST be true and NOT can be true.
So if we can prove that an option MUST NOT necessarily be true ( can be false ) then we can eliminate that option. The right option cannot be falsified.
So you cannot be a professor, if you are below 18 unless you are Brilliant. .................(1)
To be a legal voter you must be above 18 and you may or may not be a professor......... (2)
If you are brilliant and below 18 , you are definitely NOT a legal voter, you may or may not be a professor..(3)
(A) No professors are eighteen-year-olds: Actually We have info. for ONLY under 18, nothing is said about EXACTLY 18 years old, hence we cannot deduce anything from the statement and Since this statement is not based on the argument it is outside scope hence need not necessarily be true.Irrelevant INCORRECT
(B)Last line of the argument clearly says some brilliant people are professors, some are legal voters, and some are under eighteen: So "ALL" in this option is definitely not true. INCORRECT.
(C) Actually nothing is given in the argument about this. Since this statement is not based on the argument it is outside scope Hence we cannot deduce anything from this, hence need not be true. Irrelevant INCORRECT.i.e.In a group of professors who are above 18, all are legal voters.
(D) Some professors are neither legal voters nor brilliant people: Well, if you are a professor, and NOT a legal voter( i.e you are below 18 ) then you must be Brilliant . Hence this option is definitely NOT true. INCORRECT.
(E)Because a Brilliant person can be below 18, the below 18 person cannot be a legal voter. So some brilliant people need not be legal voters (Nor professors) point no.3 in the explanation , definitely true. CORRECT.
The word SOME in C, makes it a bit tricky.But since C is outside scope of the argument, we should not assume it is true.Between C and E , option E is definitely stronger.
Hope it's clear.
